Exactly, I have seen this at a few companies where the management isn't clear about the responsibilities with the candidate at the time of hiring, only to find out later that the candidate and company has different priorities. I will also add that this is the job of the company to find out the whether the candidate is right fit and not the candidate. The hiring company should be completely transparent about the job responsibilities and work.

Also some management people have completely unrealistic expectations from a hire whose job they hardly understand and with whom they never really talked openly.